1220231331 has 32 divisors (see below), whose sum is σ = 2035722240. Its totient is φ = 715672800.

The previous prime is 1220231329. The next prime is 1220231359. The reversal of 1220231331 is 1331320221.

It is not a de Polignac number, because 1220231331 - 2¹ = 1220231329 is a prime.

It is a super-2 number, since 2×1220231331² = 2977929002308063122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221231331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57060 + ... + 75473.

It is an arithmetic number, because the mean of its divisors is an integer number (63616320).

Almost surely, 2^1220231331 is an apocalyptic number.

1220231331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220231331 is a deficient number, since it is larger than the sum of its proper divisors (815490909).

1220231331 is a wasteful number, since it uses less digits than its factorization.

1220231331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132584 (or 132578 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1220231331 is about 34931.8097298150. The cubic root of 1220231331 is about 1068.5972625066.

Adding to 1220231331 its reverse (1331320221), we get a palindrome (2551551552).

The spelling of 1220231331 in words is "one billion, two hundred twenty million, two hundred thirty-one thousand, three hundred thirty-one".